Energy band diagram of the electron field emission. (a) Normal and (b) strong applied electrostatic bias fields in a FE nanodiode. The dashed line shows the potential distribution for a FE microdiode, with a distant anode (not shown here) and a very large anode-to-cathode distance.
Cheng et al. Nanoscale Research Letters 2012 7:125 doi:10.1186/1556-276X-7-125